Process for preparing pellets of hydrolyzed ethylene-vinyl aceta

Details Process for preparing pellets of hydrolyzed ethylene-vinyl aceta Process for preparing pellets of hydrolyzed ethylene-vinyl aceta

1988-02-22

1989-07-11

Schofer, Joseph L.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Treating polymer containing material or treating a solid...

528491, 528497, 525 60, 264178R, 26433115, C08F 606, C08F 812

Patent

active

048473618

ABSTRACT:
A process for preparing pellets of a hydrolyzed ethylene-vinyl acetate copolymer which comprises extruding a solution of a hydrolyzed ethylene-vinyl acetate copolymer in methanol or a mixture of water and methanol into a coagulating liquid in the form of a strand, and cutting the strand into pellets, the coagulating liquid consisting essentially of an organic solvent having a boiling point of not more than 100.degree. C., and being compatible with methanol but not being capable of dissolving the hydrolyzed ethylene-vinyl acetate copolymer. According to the present invention, the pellets from which impurities such as sodium acetate can be efficiently removed, and which have excellent thermal stability and moldability can be obtained in high productivity.

REFERENCES:
patent: 3102775 (1963-09-01), Seeger
patent: 3562234 (1971-02-01), Resz et al.
patent: 3847845 (1974-11-01), Tada et al.
patent: 3925336 (1975-12-01), Sawada
patent: 4119687 (1978-10-01), Resz et al.
patent: 4265799 (1981-05-01), McClain
patent: 4547329 (1985-10-01), Dombroski et al.
Toyoshima, "General Properties of Polyvinyl Alcohol in Relation to its Applications" in Polyvinyl Alcohol, Finch (ed.), Wiley-Interscience (1973), pp. 39-40.

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